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https://code.google.com/p/dart/issues/detail?id=14172 there were two issues: * "$" needs to be reflectable * the Map needs to be observable so templates can detect when keys get added (happens after template instantiation) R=sigmund@google.com Review URL: https://codereview.chromium.org//41383002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29208 260f80e4-7a28-3924-810f-c04153c831b5